I bought this bottle along with a bottle of Camelbak with a cap. To be honest, I expected the Polar bottle to be more comfortable but less secure. Not at all! This bottle actually closes better than the Camelbak "Podium" bottle I bought in the same size which has to be physically rotated to close. I can squeeze water out of this camelbak bottle with little effort. It's almost impossible to squeeze water out of this Polar bottle when it's sealed. To be honest I think I can destroy the bottle before the water runs out. One downside is that it's very easy to not screw the cap on 100%. And since you have to squeeze the bottle to pour the water out, the water will spurt out of the cap if it's not fully tightened. I have done this several times. It's just a matter of learning how to screw the lid all the way down. I guess my other bottles screw up a bit better, this one gets pretty tight but you'll have to keep going until it's really there!
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